General Science - Physics MCQs
Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.
71. Which of the following is correct about mechanical waves?
[A] they require a medium to propagate
[B] they don’t require a medium to propagate
[C] may or may not require a medium to propagate
[D] None of the above
Show Answer
Correct Answer: A [they require a medium to propagate]
Notes:
Mechanical waves require a medium for propagation as they cannot propagate through vacuum. Waves on a string, water waves, sound waves, seismic waves, etc. are the examples of mechanical waves.
72. What kind of waves are produced in a cylinder containing a liquid by moving its piston back and forth?
[A] Transverse
[B] Longitudinal
[C] Transverse or longitudinal
[D] None of the above
Show Answer
Correct Answer: B [Longitudinal]
Notes:
Longitudinal waves are produced in a cylinder containing a liquid by moving its piston back and forth.
73. What do we call the magnitude of the maximum disturbance in the medium on either side of the mean value called as?
[A] Frequency
[B] Angular Displacement
[C] Amplitude
[D] Wave number
Show Answer
Correct Answer: C [Amplitude]
Notes:
The magnitude of the maximum disturbance in the medium on either side of the mean value is called the amplitude of the wave. It is usually represented by the letter A.
74. Which of the following is correct about the properties of Sound waves?
[A] Sound waves are longitudinal waves
[B] Sound waves are transverse waves
[C] Sound waves are both longitudinal and transverse
[D] None of the above
Show Answer
Correct Answer: A [Sound waves are longitudinal waves]
Notes:
Sound waves are longitudinal waves. In these waves the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance.
75. Which of the following represents Boyle’s law?
[A] Pressure = Volume when temperature is constant
[B] Pressure x Volume = constant when temperature is constant
[C] Pressure =2 x Volume when temperature is constant
[D] None of the above
Show Answer
Correct Answer: B [Pressure x Volume = constant when temperature is constant]
Notes:
When temperature is held constant, the pressure and volume of a quantity of gas are related as PV = constant. This relationship is known as Boyle’s law
76. What is meant by Calorimetry?
[A] Measurement of heat
[B] Measurement of temperature
[C] Measurement of specific heat capacity
[D] None of the above
Show Answer
Correct Answer: A [Measurement of heat]
Notes:
Calorimetry means measurement of heat. A device in which heat measurement can be done is called a calorimeter.
77. Which of the following is correct about Convection?
[A] It is possible in solids only
[B] It is possible in fluids only
[C] It is possible in solids and gases only
[D] None of the above
Show Answer
Correct Answer: B [It is possible in fluids only]
Notes:
Convection is a mode of heat transfer by actual motion of matter. It is possible only in fluids.
78. What is the branch of physics that deals with the concepts of heat and temperature and the inter-conversion of heat and other forms of energy is known as?
[A] Calorimetry
[B] Thermodynamics
[C] Thermostatics
[D] Electrostatics
Show Answer
Correct Answer: B [Thermodynamics]
Notes:
Thermodynamics is the branch of physics that deals with the concepts of heat and temperature and the inter-conversion of heat and other forms of energy.
79. How many joules are there in one calorie?
[A] 3.186 J
[B] 4.186 J
[C] 5.186 J
[D] 6.186 J
Show Answer
Correct Answer: B [4.186 J]
Notes:
There are 4.186 J in once calorie.
80. Which of the following is the mirror formula?
[A] v + u =f
[B] 1/v + 1/u = 1/f
[C] 1/v + 1/u = f
[D] None of the above
Show Answer
Correct Answer: B [1/v + 1/u = 1/f]
Notes:
Mirror formula represents image distance (v), object distance (u) and focal length (f) of the mirror. The mirror formula is 1/v + 1/u = 1/f. In case of lens it is 1/v – 1/u = 1/f.
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